All posts by Gerhard Bleys

Hybrid Polymer Polyols

Title: HYBRID PHD/PMPO POLYOLS FOR POLYURETHANE FOAM APPLICATIONS

Number/Link: WO2013090325 (=US20130158142)

Applicant/Assignee: Bayer

Publication date: 20-06-2013

“Gist”: A hybrid SAN-PHD filled polyol allows for higher solids content and lower viscosity.

Why it is interesting: “Filled polyols” (i.e. polyols containing dispersed particles) are well known in polyurethane technology and are available in three types depending on the type of particles dispersed. “PIPA” polyols contain polyurethane particles, “PHD” polyols contain polyurea (“polyharnstoff”) particles and “polymer polyols” contain SAN (styrene-acrylonitrile) particles. The polyol in which the particles are dispersed is called the ‘base polyol’. The current invention teaches the preparation of a hybrid filled polyol by using PIPA or PHD polyol as (optionally part of) the base polyol to produce a SAN polymer polyol. The hybrid polymer polyol reportedly has has a lower viscosity at higher solids content and foams produced with it are claimed to have improved fire and VOC properties.

SAN

Rigid Polyurethane Foam Containing Expandable Particles

Title: Highly Insulating Polyurethane Foam and Method for Manufacturing Same

Number/Link:US2013/0150470

Applicant/Assignee: Cheil Industries

Publication date: 13-06-2013 (priority PCT/KR)

“Gist”: Rigid foams comprising thermally expandable particles which penetrate cell walls and which are covered with an infrared absorbing filler show improved insulation properties.

Why it is interesting: The invention claims to improve insulation properties of rigid foams by including about 5% (on the total resin) of organic thermally expandable particles with a diameter of about 5 μm before expansion and of about 50 μm after expansion. A filler chosen from carbon black, graphite, carbon nanotubes and the like is added as well. After the foam is formed the expanded particles penetrate the cell walls, are supposedly covered with the filler and are believed to reduce the radiation component of the thermal conductivity. Foam properties given in the examples show a density of about 35 kg/m³ with a thermal conductivity of about 0.0160 kcal/m.h.ºC (or about 0.019 W/m.K if I converted this correctly).

fig 2 form the patent. Large circles are expanded particles, smaal circles is filler.

Fig 2 form the patent: large circles are the expanded particles, the small circles represent the filler.

More Non-Isocyanate Polyurethanes

Title: METHOD FOR PREPARING POLY(CARBONATE-URETHANE) OR POLY(ESTER-URETHANE)

Number/Link: US20130144027

Applicant/Assignee: CENTRE NAT RECH SCIENT; TOTAL RES & TECHNOLOGY

Publication date: 6-06-2013 (priority PCT/EP)

“Gist”: Non-isocyanate polycarbonate- or polyester- polyurethane with very high softblock molecular weight produced by “immortal” ring opening polymerization.

Why it is interesting: Non-isocyanate PU systems appear to become a growing trend – at least in scientific and patent literature. In addition to not using phosgene or isocyanates, advantages quoted are improved biodegradability and recyclability. The current invention teaches the use of “immortal” ringopening polymerization to polymerize 5,6 or 7 membered cyclic carbonates or cyclic esters. This type of ROP is highly efficient and is described in e.g. US2011092664. The resulting polymer is subsequently modified with anhydrides to a polymer with carboxylic end-groups, which are then reacted with cyclic carbonates bearing hydroxyl groups. The resulting polymer has a MW of (preferably) 50,000 to 100,000 and can be reacted with polyamines to produce the polyurethanes. See the reaction scheme below.

Reaction sequence according to the invention

Innovation in Polyurethanes

All posts by Gerhard Bleys

Hybrid Polymer Polyols

Rigid Polyurethane Foam Containing Expandable Particles

More Non-Isocyanate Polyurethanes

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